Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Cash flows from operating activities:
Net income	$ 56,000	$ 60,407
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	37,502	32,831
Amortization	5,321	4,685
(Gain) loss on disposition / impairment of fixed assets	(498)	280
Gain on sale of marketable securities	(1,734)	(708)
Gain on sale of intangible assets	(250)	0
Gain on acquisition of business	0	(414)
Deferred income taxes	9,370	2,045
Changes in operating assets and liabilities:
Inventories	11,824	(9,190)
Accounts receivable and prepaid expenses	(8,490)	(194)
Income taxes recoverable	(4,624)	1,187
Accounts payable and other liabilities	5,997	(8,264)
Income taxes payable	(1,359)	12,257
Other	(21)	652
Net cash provided by operating activities	109,038	95,574
Cash flows from investing activities:
Purchase of property and equipment	(89,286)	(75,411)
Proceeds from the sale of property and equipment	3,626	325
Purchase of marketable securities	(10,570)	(10,935)
Proceeds from maturities of marketable securities	650	0
Proceeds from the sale of marketable securities	17,984	17,936
Acquisition of business	0	(6,116)
Purchase of intangible assets	(698)	(234)
Proceeds from the sale of intangible assets	250	0
Net cash used in investing activities	(78,044)	(74,435)
Cash flows from financing activities:
Dividends paid	(24,209)	(24,208)
Net cash used in financing activities	(24,209)	(24,208)
Net increase (decrease) in cash and cash equivalents	6,785	(3,069)
Cash and cash equivalents at beginning of year	21,439	37,392
Cash and cash equivalents at end of period	$ 28,224	$ 34,323